What Lab Tests to Track on a Peptide Protocol

Why Lab Testing Matters

Running a peptide protocol without baseline bloodwork is like driving without a dashboard. You may feel fine, but you don't know what's happening underneath. Lab testing lets you:

• Establish your baseline before you start
• Confirm the peptide is having its intended effect
• Catch unexpected changes early (hormones, liver, kidney)
• Optimize your protocol based on data, not guesswork

Baseline Tests (Before Any Protocol)

Order these before you begin, ideally 1–2 weeks in advance:

General Health Panel

• Complete Blood Count (CBC) — red cells, white cells, platelets
• Comprehensive Metabolic Panel (CMP) — kidney function (creatinine, BUN), liver enzymes (ALT, AST), electrolytes, blood glucose
• Lipid Panel — total cholesterol, LDL, HDL, triglycerides

Hormonal Baseline

• IGF-1 — critical if running GH secretagogues (Ipamorelin, CJC-1295). This is your primary marker for GH axis activity.
• Total and Free Testosterone — affected by some peptides and general health
• Thyroid Panel (TSH, Free T3, Free T4) — thyroid function
• Fasting Insulin + HbA1c — especially important if running GLP-1s (semaglutide, tirzepatide)

Protocol-Specific Tests

Running GH Secretagogues (Ipamorelin, CJC-1295, GHRH analogs)

Primary marker:

• IGF-1 — IGF-1 is the downstream marker of GH activity. It's more stable than GH itself (which fluctuates throughout the day). You want to see IGF-1 in the upper-normal range, not above it.

Red flags:

• IGF-1 above range → reduce dose or frequency
• Elevated fasting glucose → GH can cause insulin resistance; monitor blood sugar

Testing frequency: Before starting, at 6 weeks, at 12 weeks.

Running GLP-1s (Semaglutide, Tirzepatide, Retatrutide)

Primary markers:

• HbA1c — 3-month blood sugar average. If running for weight loss, this should be trending down.
• Fasting glucose — short-term marker
• Body weight + waist circumference — not a lab test, but essential data
• Lipid panel — GLP-1s typically improve lipids; good to track

Red flags:

• Severe nausea/vomiting not improving after 4 weeks at a dose
• Unexplained weight loss faster than 1–2 lbs/week (may indicate too-aggressive titration)
• Rising creatinine (kidney stress from dehydration due to GI side effects)

Running Healing Peptides (BPC-157, TB-500)

These peptides have minimal systemic hormonal effects, so you don't need extensive monitoring. Focus on:

• CRP (C-Reactive Protein) — inflammation marker. Should decrease with successful anti-inflammatory protocols.
• ESR (Erythrocyte Sedimentation Rate) — secondary inflammation marker
• Functional markers: pain scores, range of motion, subjective recovery

How to Read Your Results

IGF-1

• Reference range: ~115–307 ng/mL (varies by age and lab)
• Goal on GH secretagogues: Upper third of normal range
• Too high? Associated with long-term risks. Reduce dose.

Liver Enzymes (ALT, AST)

• Normal: ALT < 40 U/L, AST < 40 U/L
• Mild elevation (1–2x normal) may be transient and not clinically significant
• Persistent elevation > 3x normal: stop protocol, investigate

Fasting Glucose

• Normal: 70–100 mg/dL
• Pre-diabetic: 100–125 mg/dL
• GH secretagogues can push fasting glucose up — watch this if you're pre-diabetic

Tracking Your Results Over Time

A single lab result tells you less than a trend. The most useful approach is to:

• Test before starting
• Test at 6 weeks
• Test at 12 weeks
• Compare the trend — not just the number

Log your results alongside your dose, frequency, and any subjective notes. This is exactly what the PepStack protocol tracker (coming soon) will help you do automatically.

Where to Get Lab Tests

• With a doctor: Most comprehensive and covered by insurance for legitimate indications
• Direct-to-consumer labs: Services like Ulta Lab Tests, Walk-In Lab, or LabCorp On-Demand allow ordering your own panels without a prescription (at your own expense)

Disclaimer

This guide is for informational purposes only and does not constitute medical advice. Lab interpretation should be done in consultation with a licensed healthcare provider who has access to your full medical history.